Fig.1 Diagram of optical indicatrix and equi-frequency con-tour in k space,separation of phase and group veloci-ty is also shown.是什么意思_Fig.1 Diagram of optical indicatrix and equi-frequency con-tour in k space,separation of phase and group veloci-ty is also shown.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句